title: Schizophrenia: age at onset, gender and familial risk.
abstract: In a family history study of 366 schizophrenic probands and their 1851 first-degree relatives, we found a relationship between age at onset of psychosis in the male probands and the risk for schizophrenia in their relatives. The relatives of male schizophrenic probands whose onset of psychosis occurred when they were younger than 17 years of age had an increased risk of schizophrenia when compared with the relatives of male probands with an age at onset greater than 17. We did not find an association between age at onset of psychosis in the female probands and familial risk. Cox proportional hazards models permitted us to examine the relationship between age at onset of psychosis in the probands and familial risk while controlling for possible confounding effects.
authors.affiliation: Department of Psychiatry and Behavioral Sciences, School of Medicine, Johns Hopkins University, Baltimore, Maryland 21231.
authors.forename: A E
authors.initials: AE
authors.lastname: Pulver
authors.forename: C H
authors.initials: CH
authors.lastname: Brown
authors.forename: P
authors.initials: P
authors.lastname: Wolyniec
authors.forename: J
authors.initials: J
authors.lastname: McGrath
authors.forename: D
authors.initials: D
authors.lastname: Tam
authors.forename: L
authors.initials: L
authors.lastname: Adler
authors.forename: W T
authors.initials: WT
authors.lastname: Carpenter
authors.forename: B
authors.initials: B
authors.lastname: Childs
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D005260:Female; D006760:Hospitalization; D006801:Humans; D008297:Male; D008875:Middle Aged; D011569:Psychiatric Status Rating Scales; D011618:Psychotic Disorders / Q000175:diagnosis / Q000235:genetics / Q000523:psychology; D012307:Risk Factors; D012559:Schizophrenia / Q000175:diagnosis / Q000235:genetics*; D012565:Schizophrenic Psychology; D012737:Sex Factors